7-5 复数的输入输出运算符重载

对于复数的输入输出运算符重载，可以定义如下：

#include <iostream>

class Complex {
private:
    double real;
    double imag;

public:
    Complex(double r = 0, double i = 0):real(r), imag(i) {}

    friend std::ostream& operator<<(std::ostream& os, const Complex& c);
    friend std::istream& operator>>(std::istream& is, Complex& c);
};

std::ostream& operator<<(std::ostream& os, const Complex& c) {
    os << "(" << c.real << "," << c.imag << ")";
    return os;
}

std::istream& operator>>(std::istream& is, Complex& c) {
    std::cout << "Enter Real Part: ";
    is >> c.real;
    std::cout << "Enter Imaginary Part: ";
    is >> c.imag;
    return is;
}

int main() {
    Complex c;

    std::cin >> c;
    std::cout << "The Complex Number is: " << c << std::endl;

    return 0;
}

运行结果如下：

Enter Real Part: 7
Enter Imaginary Part: -5
The Complex Number is: (7,-5)